1912021 has 4 divisors (see below), whose sum is σ = 1920672. Its totient is φ = 1903372.

The previous prime is 1912019. The next prime is 1912061. The reversal of 1912021 is 1202191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1912021 - 2¹ = 1912019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1911986 and 1912004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1912061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3985 + ... + 4438.

It is an arithmetic number, because the mean of its divisors is an integer number (480168).

2^1912021 is an apocalyptic number.

It is an amenable number.

1912021 is a deficient number, since it is larger than the sum of its proper divisors (8651).

1912021 is an equidigital number, since it uses as much as digits as its factorization.

1912021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8650.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1912021 is about 1382.7584749333. The cubic root of 1912021 is about 124.1168902974.

The spelling of 1912021 in words is "one million, nine hundred twelve thousand, twenty-one".